1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // STMicroelectronics FTS Touchscreen device driver |
3 | // |
4 | // Copyright (c) 2017 Samsung Electronics Co., Ltd. |
5 | // Copyright (c) 2017 Andi Shyti <andi@etezian.org> |
6 | |
7 | #include <linux/delay.h> |
8 | #include <linux/i2c.h> |
9 | #include <linux/input/mt.h> |
10 | #include <linux/input/touchscreen.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/irq.h> |
13 | #include <linux/leds.h> |
14 | #include <linux/module.h> |
15 | #include <linux/pm_runtime.h> |
16 | #include <linux/regulator/consumer.h> |
17 | |
18 | /* I2C commands */ |
19 | #define STMFTS_READ_INFO 0x80 |
20 | #define STMFTS_READ_STATUS 0x84 |
21 | #define STMFTS_READ_ONE_EVENT 0x85 |
22 | #define STMFTS_READ_ALL_EVENT 0x86 |
23 | #define STMFTS_LATEST_EVENT 0x87 |
24 | #define STMFTS_SLEEP_IN 0x90 |
25 | #define STMFTS_SLEEP_OUT 0x91 |
26 | #define STMFTS_MS_MT_SENSE_OFF 0x92 |
27 | #define STMFTS_MS_MT_SENSE_ON 0x93 |
28 | #define STMFTS_SS_HOVER_SENSE_OFF 0x94 |
29 | #define STMFTS_SS_HOVER_SENSE_ON 0x95 |
30 | #define STMFTS_MS_KEY_SENSE_OFF 0x9a |
31 | #define STMFTS_MS_KEY_SENSE_ON 0x9b |
32 | #define STMFTS_SYSTEM_RESET 0xa0 |
33 | #define STMFTS_CLEAR_EVENT_STACK 0xa1 |
34 | #define STMFTS_FULL_FORCE_CALIBRATION 0xa2 |
35 | #define STMFTS_MS_CX_TUNING 0xa3 |
36 | #define STMFTS_SS_CX_TUNING 0xa4 |
37 | |
38 | /* events */ |
39 | #define STMFTS_EV_NO_EVENT 0x00 |
40 | #define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02 |
41 | #define STMFTS_EV_MULTI_TOUCH_ENTER 0x03 |
42 | #define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04 |
43 | #define STMFTS_EV_MULTI_TOUCH_MOTION 0x05 |
44 | #define STMFTS_EV_HOVER_ENTER 0x07 |
45 | #define STMFTS_EV_HOVER_LEAVE 0x08 |
46 | #define STMFTS_EV_HOVER_MOTION 0x09 |
47 | #define STMFTS_EV_KEY_STATUS 0x0e |
48 | #define STMFTS_EV_ERROR 0x0f |
49 | #define STMFTS_EV_CONTROLLER_READY 0x10 |
50 | #define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11 |
51 | #define STMFTS_EV_STATUS 0x16 |
52 | #define STMFTS_EV_DEBUG 0xdb |
53 | |
54 | /* multi touch related event masks */ |
55 | #define STMFTS_MASK_EVENT_ID 0x0f |
56 | #define STMFTS_MASK_TOUCH_ID 0xf0 |
57 | #define STMFTS_MASK_LEFT_EVENT 0x0f |
58 | #define STMFTS_MASK_X_MSB 0x0f |
59 | #define STMFTS_MASK_Y_LSB 0xf0 |
60 | |
61 | /* key related event masks */ |
62 | #define STMFTS_MASK_KEY_NO_TOUCH 0x00 |
63 | #define 0x01 |
64 | #define STMFTS_MASK_KEY_BACK 0x02 |
65 | |
66 | #define STMFTS_EVENT_SIZE 8 |
67 | #define STMFTS_STACK_DEPTH 32 |
68 | #define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH) |
69 | #define STMFTS_MAX_FINGERS 10 |
70 | #define STMFTS_DEV_NAME "stmfts" |
71 | |
72 | enum stmfts_regulators { |
73 | STMFTS_REGULATOR_VDD, |
74 | STMFTS_REGULATOR_AVDD, |
75 | }; |
76 | |
77 | struct stmfts_data { |
78 | struct i2c_client *client; |
79 | struct input_dev *input; |
80 | struct led_classdev led_cdev; |
81 | struct mutex mutex; |
82 | |
83 | struct touchscreen_properties prop; |
84 | |
85 | struct regulator_bulk_data regulators[2]; |
86 | |
87 | /* |
88 | * Presence of ledvdd will be used also to check |
89 | * whether the LED is supported. |
90 | */ |
91 | struct regulator *ledvdd; |
92 | |
93 | u16 chip_id; |
94 | u8 chip_ver; |
95 | u16 fw_ver; |
96 | u8 config_id; |
97 | u8 config_ver; |
98 | |
99 | u8 data[STMFTS_DATA_MAX_SIZE]; |
100 | |
101 | struct completion cmd_done; |
102 | |
103 | bool use_key; |
104 | bool led_status; |
105 | bool hover_enabled; |
106 | bool running; |
107 | }; |
108 | |
109 | static int stmfts_brightness_set(struct led_classdev *led_cdev, |
110 | enum led_brightness value) |
111 | { |
112 | struct stmfts_data *sdata = container_of(led_cdev, |
113 | struct stmfts_data, led_cdev); |
114 | int err; |
115 | |
116 | if (value != sdata->led_status && sdata->ledvdd) { |
117 | if (!value) { |
118 | regulator_disable(regulator: sdata->ledvdd); |
119 | } else { |
120 | err = regulator_enable(regulator: sdata->ledvdd); |
121 | if (err) { |
122 | dev_warn(&sdata->client->dev, |
123 | "failed to disable ledvdd regulator: %d\n" , |
124 | err); |
125 | return err; |
126 | } |
127 | } |
128 | sdata->led_status = value; |
129 | } |
130 | |
131 | return 0; |
132 | } |
133 | |
134 | static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev) |
135 | { |
136 | struct stmfts_data *sdata = container_of(led_cdev, |
137 | struct stmfts_data, led_cdev); |
138 | |
139 | return !!regulator_is_enabled(regulator: sdata->ledvdd); |
140 | } |
141 | |
142 | /* |
143 | * We can't simply use i2c_smbus_read_i2c_block_data because we |
144 | * need to read more than 255 bytes ( |
145 | */ |
146 | static int stmfts_read_events(struct stmfts_data *sdata) |
147 | { |
148 | u8 cmd = STMFTS_READ_ALL_EVENT; |
149 | struct i2c_msg msgs[2] = { |
150 | { |
151 | .addr = sdata->client->addr, |
152 | .len = 1, |
153 | .buf = &cmd, |
154 | }, |
155 | { |
156 | .addr = sdata->client->addr, |
157 | .flags = I2C_M_RD, |
158 | .len = STMFTS_DATA_MAX_SIZE, |
159 | .buf = sdata->data, |
160 | }, |
161 | }; |
162 | int ret; |
163 | |
164 | ret = i2c_transfer(adap: sdata->client->adapter, msgs, ARRAY_SIZE(msgs)); |
165 | if (ret < 0) |
166 | return ret; |
167 | |
168 | return ret == ARRAY_SIZE(msgs) ? 0 : -EIO; |
169 | } |
170 | |
171 | static void stmfts_report_contact_event(struct stmfts_data *sdata, |
172 | const u8 event[]) |
173 | { |
174 | u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; |
175 | u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8); |
176 | u16 y = (event[2] >> 4) | (event[3] << 4); |
177 | u8 maj = event[4]; |
178 | u8 min = event[5]; |
179 | u8 orientation = event[6]; |
180 | u8 area = event[7]; |
181 | |
182 | input_mt_slot(dev: sdata->input, slot: slot_id); |
183 | |
184 | input_mt_report_slot_state(dev: sdata->input, MT_TOOL_FINGER, active: true); |
185 | input_report_abs(dev: sdata->input, ABS_MT_POSITION_X, value: x); |
186 | input_report_abs(dev: sdata->input, ABS_MT_POSITION_Y, value: y); |
187 | input_report_abs(dev: sdata->input, ABS_MT_TOUCH_MAJOR, value: maj); |
188 | input_report_abs(dev: sdata->input, ABS_MT_TOUCH_MINOR, value: min); |
189 | input_report_abs(dev: sdata->input, ABS_MT_PRESSURE, value: area); |
190 | input_report_abs(dev: sdata->input, ABS_MT_ORIENTATION, value: orientation); |
191 | |
192 | input_sync(dev: sdata->input); |
193 | } |
194 | |
195 | static void stmfts_report_contact_release(struct stmfts_data *sdata, |
196 | const u8 event[]) |
197 | { |
198 | u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; |
199 | |
200 | input_mt_slot(dev: sdata->input, slot: slot_id); |
201 | input_mt_report_slot_inactive(dev: sdata->input); |
202 | |
203 | input_sync(dev: sdata->input); |
204 | } |
205 | |
206 | static void stmfts_report_hover_event(struct stmfts_data *sdata, |
207 | const u8 event[]) |
208 | { |
209 | u16 x = (event[2] << 4) | (event[4] >> 4); |
210 | u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB); |
211 | u8 z = event[5]; |
212 | |
213 | input_report_abs(dev: sdata->input, ABS_X, value: x); |
214 | input_report_abs(dev: sdata->input, ABS_Y, value: y); |
215 | input_report_abs(dev: sdata->input, ABS_DISTANCE, value: z); |
216 | |
217 | input_sync(dev: sdata->input); |
218 | } |
219 | |
220 | static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[]) |
221 | { |
222 | switch (event[2]) { |
223 | case 0: |
224 | input_report_key(dev: sdata->input, KEY_BACK, value: 0); |
225 | input_report_key(dev: sdata->input, KEY_MENU, value: 0); |
226 | break; |
227 | |
228 | case STMFTS_MASK_KEY_BACK: |
229 | input_report_key(dev: sdata->input, KEY_BACK, value: 1); |
230 | break; |
231 | |
232 | case STMFTS_MASK_KEY_MENU: |
233 | input_report_key(dev: sdata->input, KEY_MENU, value: 1); |
234 | break; |
235 | |
236 | default: |
237 | dev_warn(&sdata->client->dev, |
238 | "unknown key event: %#02x\n" , event[2]); |
239 | break; |
240 | } |
241 | |
242 | input_sync(dev: sdata->input); |
243 | } |
244 | |
245 | static void stmfts_parse_events(struct stmfts_data *sdata) |
246 | { |
247 | int i; |
248 | |
249 | for (i = 0; i < STMFTS_STACK_DEPTH; i++) { |
250 | u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE]; |
251 | |
252 | switch (event[0]) { |
253 | |
254 | case STMFTS_EV_CONTROLLER_READY: |
255 | case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY: |
256 | case STMFTS_EV_STATUS: |
257 | complete(&sdata->cmd_done); |
258 | fallthrough; |
259 | |
260 | case STMFTS_EV_NO_EVENT: |
261 | case STMFTS_EV_DEBUG: |
262 | return; |
263 | } |
264 | |
265 | switch (event[0] & STMFTS_MASK_EVENT_ID) { |
266 | |
267 | case STMFTS_EV_MULTI_TOUCH_ENTER: |
268 | case STMFTS_EV_MULTI_TOUCH_MOTION: |
269 | stmfts_report_contact_event(sdata, event); |
270 | break; |
271 | |
272 | case STMFTS_EV_MULTI_TOUCH_LEAVE: |
273 | stmfts_report_contact_release(sdata, event); |
274 | break; |
275 | |
276 | case STMFTS_EV_HOVER_ENTER: |
277 | case STMFTS_EV_HOVER_LEAVE: |
278 | case STMFTS_EV_HOVER_MOTION: |
279 | stmfts_report_hover_event(sdata, event); |
280 | break; |
281 | |
282 | case STMFTS_EV_KEY_STATUS: |
283 | stmfts_report_key_event(sdata, event); |
284 | break; |
285 | |
286 | case STMFTS_EV_ERROR: |
287 | dev_warn(&sdata->client->dev, |
288 | "error code: 0x%x%x%x%x%x%x" , |
289 | event[6], event[5], event[4], |
290 | event[3], event[2], event[1]); |
291 | break; |
292 | |
293 | default: |
294 | dev_err(&sdata->client->dev, |
295 | "unknown event %#02x\n" , event[0]); |
296 | } |
297 | } |
298 | } |
299 | |
300 | static irqreturn_t stmfts_irq_handler(int irq, void *dev) |
301 | { |
302 | struct stmfts_data *sdata = dev; |
303 | int err; |
304 | |
305 | mutex_lock(&sdata->mutex); |
306 | |
307 | err = stmfts_read_events(sdata); |
308 | if (unlikely(err)) |
309 | dev_err(&sdata->client->dev, |
310 | "failed to read events: %d\n" , err); |
311 | else |
312 | stmfts_parse_events(sdata); |
313 | |
314 | mutex_unlock(lock: &sdata->mutex); |
315 | return IRQ_HANDLED; |
316 | } |
317 | |
318 | static int stmfts_command(struct stmfts_data *sdata, const u8 cmd) |
319 | { |
320 | int err; |
321 | |
322 | reinit_completion(x: &sdata->cmd_done); |
323 | |
324 | err = i2c_smbus_write_byte(client: sdata->client, value: cmd); |
325 | if (err) |
326 | return err; |
327 | |
328 | if (!wait_for_completion_timeout(x: &sdata->cmd_done, |
329 | timeout: msecs_to_jiffies(m: 1000))) |
330 | return -ETIMEDOUT; |
331 | |
332 | return 0; |
333 | } |
334 | |
335 | static int stmfts_input_open(struct input_dev *dev) |
336 | { |
337 | struct stmfts_data *sdata = input_get_drvdata(dev); |
338 | int err; |
339 | |
340 | err = pm_runtime_resume_and_get(dev: &sdata->client->dev); |
341 | if (err) |
342 | return err; |
343 | |
344 | err = i2c_smbus_write_byte(client: sdata->client, STMFTS_MS_MT_SENSE_ON); |
345 | if (err) { |
346 | pm_runtime_put_sync(dev: &sdata->client->dev); |
347 | return err; |
348 | } |
349 | |
350 | mutex_lock(&sdata->mutex); |
351 | sdata->running = true; |
352 | |
353 | if (sdata->hover_enabled) { |
354 | err = i2c_smbus_write_byte(client: sdata->client, |
355 | STMFTS_SS_HOVER_SENSE_ON); |
356 | if (err) |
357 | dev_warn(&sdata->client->dev, |
358 | "failed to enable hover\n" ); |
359 | } |
360 | mutex_unlock(lock: &sdata->mutex); |
361 | |
362 | if (sdata->use_key) { |
363 | err = i2c_smbus_write_byte(client: sdata->client, |
364 | STMFTS_MS_KEY_SENSE_ON); |
365 | if (err) |
366 | /* I can still use only the touch screen */ |
367 | dev_warn(&sdata->client->dev, |
368 | "failed to enable touchkey\n" ); |
369 | } |
370 | |
371 | return 0; |
372 | } |
373 | |
374 | static void stmfts_input_close(struct input_dev *dev) |
375 | { |
376 | struct stmfts_data *sdata = input_get_drvdata(dev); |
377 | int err; |
378 | |
379 | err = i2c_smbus_write_byte(client: sdata->client, STMFTS_MS_MT_SENSE_OFF); |
380 | if (err) |
381 | dev_warn(&sdata->client->dev, |
382 | "failed to disable touchscreen: %d\n" , err); |
383 | |
384 | mutex_lock(&sdata->mutex); |
385 | |
386 | sdata->running = false; |
387 | |
388 | if (sdata->hover_enabled) { |
389 | err = i2c_smbus_write_byte(client: sdata->client, |
390 | STMFTS_SS_HOVER_SENSE_OFF); |
391 | if (err) |
392 | dev_warn(&sdata->client->dev, |
393 | "failed to disable hover: %d\n" , err); |
394 | } |
395 | mutex_unlock(lock: &sdata->mutex); |
396 | |
397 | if (sdata->use_key) { |
398 | err = i2c_smbus_write_byte(client: sdata->client, |
399 | STMFTS_MS_KEY_SENSE_OFF); |
400 | if (err) |
401 | dev_warn(&sdata->client->dev, |
402 | "failed to disable touchkey: %d\n" , err); |
403 | } |
404 | |
405 | pm_runtime_put_sync(dev: &sdata->client->dev); |
406 | } |
407 | |
408 | static ssize_t stmfts_sysfs_chip_id(struct device *dev, |
409 | struct device_attribute *attr, char *buf) |
410 | { |
411 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
412 | |
413 | return sprintf(buf, fmt: "%#x\n" , sdata->chip_id); |
414 | } |
415 | |
416 | static ssize_t stmfts_sysfs_chip_version(struct device *dev, |
417 | struct device_attribute *attr, char *buf) |
418 | { |
419 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
420 | |
421 | return sprintf(buf, fmt: "%u\n" , sdata->chip_ver); |
422 | } |
423 | |
424 | static ssize_t stmfts_sysfs_fw_ver(struct device *dev, |
425 | struct device_attribute *attr, char *buf) |
426 | { |
427 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
428 | |
429 | return sprintf(buf, fmt: "%u\n" , sdata->fw_ver); |
430 | } |
431 | |
432 | static ssize_t stmfts_sysfs_config_id(struct device *dev, |
433 | struct device_attribute *attr, char *buf) |
434 | { |
435 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
436 | |
437 | return sprintf(buf, fmt: "%#x\n" , sdata->config_id); |
438 | } |
439 | |
440 | static ssize_t stmfts_sysfs_config_version(struct device *dev, |
441 | struct device_attribute *attr, char *buf) |
442 | { |
443 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
444 | |
445 | return sprintf(buf, fmt: "%u\n" , sdata->config_ver); |
446 | } |
447 | |
448 | static ssize_t stmfts_sysfs_read_status(struct device *dev, |
449 | struct device_attribute *attr, char *buf) |
450 | { |
451 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
452 | u8 status[4]; |
453 | int err; |
454 | |
455 | err = i2c_smbus_read_i2c_block_data(client: sdata->client, STMFTS_READ_STATUS, |
456 | length: sizeof(status), values: status); |
457 | if (err) |
458 | return err; |
459 | |
460 | return sprintf(buf, fmt: "%#02x\n" , status[0]); |
461 | } |
462 | |
463 | static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev, |
464 | struct device_attribute *attr, char *buf) |
465 | { |
466 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
467 | |
468 | return sprintf(buf, fmt: "%u\n" , sdata->hover_enabled); |
469 | } |
470 | |
471 | static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev, |
472 | struct device_attribute *attr, |
473 | const char *buf, size_t len) |
474 | { |
475 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
476 | unsigned long value; |
477 | int err = 0; |
478 | |
479 | if (kstrtoul(s: buf, base: 0, res: &value)) |
480 | return -EINVAL; |
481 | |
482 | mutex_lock(&sdata->mutex); |
483 | |
484 | if (value && sdata->hover_enabled) |
485 | goto out; |
486 | |
487 | if (sdata->running) |
488 | err = i2c_smbus_write_byte(client: sdata->client, |
489 | value: value ? STMFTS_SS_HOVER_SENSE_ON : |
490 | STMFTS_SS_HOVER_SENSE_OFF); |
491 | |
492 | if (!err) |
493 | sdata->hover_enabled = !!value; |
494 | |
495 | out: |
496 | mutex_unlock(lock: &sdata->mutex); |
497 | |
498 | return len; |
499 | } |
500 | |
501 | static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL); |
502 | static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL); |
503 | static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL); |
504 | static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL); |
505 | static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL); |
506 | static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL); |
507 | static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read, |
508 | stmfts_sysfs_hover_enable_write); |
509 | |
510 | static struct attribute *stmfts_sysfs_attrs[] = { |
511 | &dev_attr_chip_id.attr, |
512 | &dev_attr_chip_version.attr, |
513 | &dev_attr_fw_ver.attr, |
514 | &dev_attr_config_id.attr, |
515 | &dev_attr_config_version.attr, |
516 | &dev_attr_status.attr, |
517 | &dev_attr_hover_enable.attr, |
518 | NULL |
519 | }; |
520 | |
521 | static struct attribute_group stmfts_attribute_group = { |
522 | .attrs = stmfts_sysfs_attrs |
523 | }; |
524 | |
525 | static int stmfts_power_on(struct stmfts_data *sdata) |
526 | { |
527 | int err; |
528 | u8 reg[8]; |
529 | |
530 | err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators), |
531 | consumers: sdata->regulators); |
532 | if (err) |
533 | return err; |
534 | |
535 | /* |
536 | * The datasheet does not specify the power on time, but considering |
537 | * that the reset time is < 10ms, I sleep 20ms to be sure |
538 | */ |
539 | msleep(msecs: 20); |
540 | |
541 | err = i2c_smbus_read_i2c_block_data(client: sdata->client, STMFTS_READ_INFO, |
542 | length: sizeof(reg), values: reg); |
543 | if (err < 0) |
544 | return err; |
545 | if (err != sizeof(reg)) |
546 | return -EIO; |
547 | |
548 | sdata->chip_id = be16_to_cpup(p: (__be16 *)®[6]); |
549 | sdata->chip_ver = reg[0]; |
550 | sdata->fw_ver = be16_to_cpup(p: (__be16 *)®[2]); |
551 | sdata->config_id = reg[4]; |
552 | sdata->config_ver = reg[5]; |
553 | |
554 | enable_irq(irq: sdata->client->irq); |
555 | |
556 | msleep(msecs: 50); |
557 | |
558 | err = stmfts_command(sdata, STMFTS_SYSTEM_RESET); |
559 | if (err) |
560 | return err; |
561 | |
562 | err = stmfts_command(sdata, STMFTS_SLEEP_OUT); |
563 | if (err) |
564 | return err; |
565 | |
566 | /* optional tuning */ |
567 | err = stmfts_command(sdata, STMFTS_MS_CX_TUNING); |
568 | if (err) |
569 | dev_warn(&sdata->client->dev, |
570 | "failed to perform mutual auto tune: %d\n" , err); |
571 | |
572 | /* optional tuning */ |
573 | err = stmfts_command(sdata, STMFTS_SS_CX_TUNING); |
574 | if (err) |
575 | dev_warn(&sdata->client->dev, |
576 | "failed to perform self auto tune: %d\n" , err); |
577 | |
578 | err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION); |
579 | if (err) |
580 | return err; |
581 | |
582 | /* |
583 | * At this point no one is using the touchscreen |
584 | * and I don't really care about the return value |
585 | */ |
586 | (void) i2c_smbus_write_byte(client: sdata->client, STMFTS_SLEEP_IN); |
587 | |
588 | return 0; |
589 | } |
590 | |
591 | static void stmfts_power_off(void *data) |
592 | { |
593 | struct stmfts_data *sdata = data; |
594 | |
595 | disable_irq(irq: sdata->client->irq); |
596 | regulator_bulk_disable(ARRAY_SIZE(sdata->regulators), |
597 | consumers: sdata->regulators); |
598 | } |
599 | |
600 | /* This function is void because I don't want to prevent using the touch key |
601 | * only because the LEDs don't get registered |
602 | */ |
603 | static int stmfts_enable_led(struct stmfts_data *sdata) |
604 | { |
605 | int err; |
606 | |
607 | /* get the regulator for powering the leds on */ |
608 | sdata->ledvdd = devm_regulator_get(dev: &sdata->client->dev, id: "ledvdd" ); |
609 | if (IS_ERR(ptr: sdata->ledvdd)) |
610 | return PTR_ERR(ptr: sdata->ledvdd); |
611 | |
612 | sdata->led_cdev.name = STMFTS_DEV_NAME; |
613 | sdata->led_cdev.max_brightness = LED_ON; |
614 | sdata->led_cdev.brightness = LED_OFF; |
615 | sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set; |
616 | sdata->led_cdev.brightness_get = stmfts_brightness_get; |
617 | |
618 | err = devm_led_classdev_register(parent: &sdata->client->dev, led_cdev: &sdata->led_cdev); |
619 | if (err) { |
620 | devm_regulator_put(regulator: sdata->ledvdd); |
621 | return err; |
622 | } |
623 | |
624 | return 0; |
625 | } |
626 | |
627 | static int stmfts_probe(struct i2c_client *client) |
628 | { |
629 | int err; |
630 | struct stmfts_data *sdata; |
631 | |
632 | if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_I2C | |
633 | I2C_FUNC_SMBUS_BYTE_DATA | |
634 | I2C_FUNC_SMBUS_I2C_BLOCK)) |
635 | return -ENODEV; |
636 | |
637 | sdata = devm_kzalloc(dev: &client->dev, size: sizeof(*sdata), GFP_KERNEL); |
638 | if (!sdata) |
639 | return -ENOMEM; |
640 | |
641 | i2c_set_clientdata(client, data: sdata); |
642 | |
643 | sdata->client = client; |
644 | mutex_init(&sdata->mutex); |
645 | init_completion(x: &sdata->cmd_done); |
646 | |
647 | sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd" ; |
648 | sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd" ; |
649 | err = devm_regulator_bulk_get(dev: &client->dev, |
650 | ARRAY_SIZE(sdata->regulators), |
651 | consumers: sdata->regulators); |
652 | if (err) |
653 | return err; |
654 | |
655 | sdata->input = devm_input_allocate_device(&client->dev); |
656 | if (!sdata->input) |
657 | return -ENOMEM; |
658 | |
659 | sdata->input->name = STMFTS_DEV_NAME; |
660 | sdata->input->id.bustype = BUS_I2C; |
661 | sdata->input->open = stmfts_input_open; |
662 | sdata->input->close = stmfts_input_close; |
663 | |
664 | input_set_capability(dev: sdata->input, EV_ABS, ABS_MT_POSITION_X); |
665 | input_set_capability(dev: sdata->input, EV_ABS, ABS_MT_POSITION_Y); |
666 | touchscreen_parse_properties(input: sdata->input, multitouch: true, prop: &sdata->prop); |
667 | |
668 | input_set_abs_params(dev: sdata->input, ABS_MT_TOUCH_MAJOR, min: 0, max: 255, fuzz: 0, flat: 0); |
669 | input_set_abs_params(dev: sdata->input, ABS_MT_TOUCH_MINOR, min: 0, max: 255, fuzz: 0, flat: 0); |
670 | input_set_abs_params(dev: sdata->input, ABS_MT_ORIENTATION, min: 0, max: 255, fuzz: 0, flat: 0); |
671 | input_set_abs_params(dev: sdata->input, ABS_MT_PRESSURE, min: 0, max: 255, fuzz: 0, flat: 0); |
672 | input_set_abs_params(dev: sdata->input, ABS_DISTANCE, min: 0, max: 255, fuzz: 0, flat: 0); |
673 | |
674 | sdata->use_key = device_property_read_bool(dev: &client->dev, |
675 | propname: "touch-key-connected" ); |
676 | if (sdata->use_key) { |
677 | input_set_capability(dev: sdata->input, EV_KEY, KEY_MENU); |
678 | input_set_capability(dev: sdata->input, EV_KEY, KEY_BACK); |
679 | } |
680 | |
681 | err = input_mt_init_slots(dev: sdata->input, |
682 | STMFTS_MAX_FINGERS, INPUT_MT_DIRECT); |
683 | if (err) |
684 | return err; |
685 | |
686 | input_set_drvdata(dev: sdata->input, data: sdata); |
687 | |
688 | /* |
689 | * stmfts_power_on expects interrupt to be disabled, but |
690 | * at this point the device is still off and I do not trust |
691 | * the status of the irq line that can generate some spurious |
692 | * interrupts. To be on the safe side it's better to not enable |
693 | * the interrupts during their request. |
694 | */ |
695 | err = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
696 | NULL, thread_fn: stmfts_irq_handler, |
697 | IRQF_ONESHOT | IRQF_NO_AUTOEN, |
698 | devname: "stmfts_irq" , dev_id: sdata); |
699 | if (err) |
700 | return err; |
701 | |
702 | dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n" ); |
703 | |
704 | err = stmfts_power_on(sdata); |
705 | if (err) |
706 | return err; |
707 | |
708 | err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata); |
709 | if (err) |
710 | return err; |
711 | |
712 | err = input_register_device(sdata->input); |
713 | if (err) |
714 | return err; |
715 | |
716 | if (sdata->use_key) { |
717 | err = stmfts_enable_led(sdata); |
718 | if (err) { |
719 | /* |
720 | * Even if the LEDs have failed to be initialized and |
721 | * used in the driver, I can still use the device even |
722 | * without LEDs. The ledvdd regulator pointer will be |
723 | * used as a flag. |
724 | */ |
725 | dev_warn(&client->dev, "unable to use touchkey leds\n" ); |
726 | sdata->ledvdd = NULL; |
727 | } |
728 | } |
729 | |
730 | err = devm_device_add_group(dev: &client->dev, grp: &stmfts_attribute_group); |
731 | if (err) |
732 | return err; |
733 | |
734 | pm_runtime_enable(dev: &client->dev); |
735 | device_enable_async_suspend(dev: &client->dev); |
736 | |
737 | return 0; |
738 | } |
739 | |
740 | static void stmfts_remove(struct i2c_client *client) |
741 | { |
742 | pm_runtime_disable(dev: &client->dev); |
743 | } |
744 | |
745 | static int stmfts_runtime_suspend(struct device *dev) |
746 | { |
747 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
748 | int ret; |
749 | |
750 | ret = i2c_smbus_write_byte(client: sdata->client, STMFTS_SLEEP_IN); |
751 | if (ret) |
752 | dev_warn(dev, "failed to suspend device: %d\n" , ret); |
753 | |
754 | return ret; |
755 | } |
756 | |
757 | static int stmfts_runtime_resume(struct device *dev) |
758 | { |
759 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
760 | int ret; |
761 | |
762 | ret = i2c_smbus_write_byte(client: sdata->client, STMFTS_SLEEP_OUT); |
763 | if (ret) |
764 | dev_err(dev, "failed to resume device: %d\n" , ret); |
765 | |
766 | return ret; |
767 | } |
768 | |
769 | static int stmfts_suspend(struct device *dev) |
770 | { |
771 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
772 | |
773 | stmfts_power_off(data: sdata); |
774 | |
775 | return 0; |
776 | } |
777 | |
778 | static int stmfts_resume(struct device *dev) |
779 | { |
780 | struct stmfts_data *sdata = dev_get_drvdata(dev); |
781 | |
782 | return stmfts_power_on(sdata); |
783 | } |
784 | |
785 | static const struct dev_pm_ops stmfts_pm_ops = { |
786 | SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume) |
787 | RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL) |
788 | }; |
789 | |
790 | #ifdef CONFIG_OF |
791 | static const struct of_device_id stmfts_of_match[] = { |
792 | { .compatible = "st,stmfts" , }, |
793 | { }, |
794 | }; |
795 | MODULE_DEVICE_TABLE(of, stmfts_of_match); |
796 | #endif |
797 | |
798 | static const struct i2c_device_id stmfts_id[] = { |
799 | { "stmfts" , 0 }, |
800 | { }, |
801 | }; |
802 | MODULE_DEVICE_TABLE(i2c, stmfts_id); |
803 | |
804 | static struct i2c_driver stmfts_driver = { |
805 | .driver = { |
806 | .name = STMFTS_DEV_NAME, |
807 | .of_match_table = of_match_ptr(stmfts_of_match), |
808 | .pm = pm_ptr(&stmfts_pm_ops), |
809 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
810 | }, |
811 | .probe = stmfts_probe, |
812 | .remove = stmfts_remove, |
813 | .id_table = stmfts_id, |
814 | }; |
815 | |
816 | module_i2c_driver(stmfts_driver); |
817 | |
818 | MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>" ); |
819 | MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen" ); |
820 | MODULE_LICENSE("GPL v2" ); |
821 | |